Remove test dependency on APC

Replace use of sfAPCCache by sfFileCache on unit test so that it runs without PHP dependencies nor code that is not being tested.

test/unit/storage/sfCacheSessionStorageTest.php

@@ -20,15 +20,14 @@
 
 sfConfig::set('sf_symfony_lib_dir', realpath($_test_dir.'/../lib'));
 
+// setup cache
+$temp = tempnam('/tmp/cache_dir', 'tmp');
+unlink($temp);
+mkdir($temp);
+
 $plan = 8;
 $t = new lime_test($plan);
 
-if (!ini_get('apc.enable_cli')) {
-    $t->skip('APC must be enable on CLI to run these tests', $plan);
-
-    return;
-}
-
 // initialize the storage
 try {
     $storage = new sfCacheSessionStorage();
@@ -37,7 +36,7 @@
     $t->pass('->__construct() throws an exception when not provided a cache option');
 }
 
-$storage = new sfCacheSessionStorage(array('cache' => array('class' => 'sfAPCCache', 'param' => array())));
+$storage = new sfCacheSessionStorage(array('cache' => array('class' => 'sfFileCache', 'param' => array('cache_dir' => $temp))));
 $t->ok($storage instanceof sfStorage, '->__construct() is an instance of sfStorage');
 
 $storage->write('test', 123);
@@ -63,3 +62,7 @@
 
 // shutdown the storage
 $storage->shutdown();
+
+// clean up cache
+sfToolkit::clearDirectory($temp);
+rmdir($temp);